Anthraquinone-acridine dyestuffs



United States Patent 2,727,894 ANTHRAQUINONE-ACRIDINE DYESTUFFS Werner Zerweck, Ernst Honoid, and Max Schubert, Frankfurt am Main-Fechenheim, Germany, assignors to Cassella Farbwerke Mainkur Aktiengesellschaft, Frankfurt am Main-Fechenheim, Germany, a German company No Drawing. Application April 13, 1954, Serial No. 423,001

2 Claims. (Cl. 260-276) (wherein R means a radical of the group consisting of hydrogen, methyl, phenyl, diphenyl, furyl). They are snfiiciently soluble and dye vegetable fibers to blue shades which are outstanding in their fastness to light and resistance to weather. No damaging of the fiber is caused.

The following examples are given for the purpose of illustrating the invention, the parts being by weight and all temperatures in degrees Centigrade.

Example 1 A solution of 30 parts of 2-phenyl-benzthiazole-6-carboxylic acid chloride is allowed to flow to a suspension of 34 parts of 3.4-phthalyl-2-aminoacridone in 300 parts of dichlorobenzene at l30-150 whilst stirring. The temperature is now raised to 200 and the mass is boiled for about 6 hours under reflux. On cooling, the condensation product is filtered by suction and washed. The dyestufi thus obtained corresponds to the formula s 0 1 :13 0 ON (wherein R means a radical of the It dissolves in concentrated sulfuric acid with a brown color. The vat is violet colored. Cotton is dyed from a hot vat (according to the iN-procedure common for indanthrene dyestuffs) to very fast blue shades. The fastness to light and resistance to weather are outstanding.

Example 2 22 parts of benzthiazole-6-carboxylic acid are converted to the chloride by the aid of thionyl chloride and condensed with 34 parts of 3.4-phthalyl-2-aminoacridone in analogy to Example 1. The condensation product dissolves in concentrated sulfuric acid with a brown-red color. The color of the vat is red-violet. Cotton is dyed from a vat (according to the IW-procedure common for indanthrene dyestuffs) to fast, blue shades. The fastness to light and resistance to weather are very good.

Likewise, for instance, Z-methylbenzthiazole-6-carboxylic acid chloride, Z-dipheuyl-benzthiazole-6-carboxy1ic acid chloride or Z-furylbenzthiazole-6-carboxy1ic acid chloride may be condensed with phthalyl-aminoacridones to yield blue vat dyestuffs.

We claim:

1. The vat dyestuifs of the general formula group consisting of hydrogen, methyl, phenyl, 2-diphenyl, Z-furyl).

2. The vat dyestufl? of the formula a! t i=0 0 (5 NH-C O N References Cited in the file of this patent UNITED STATES PATENTS 

1. THE VAT DYESTUFFS OF THE GENERAL FORMULA 